<?php
/**
 * Wrapper Class for kirki which also acts as a fallback for CSS generation
 * when the kirki plugin is disabled.
 *
 * @package kirki
 */
// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
/**
 * This is a wrapper class for Kirki.
 * If the Kirki plugin is installed, then all CSS & Google fonts
 * will be handled by the plugin.
 * In case the plugin is not installed, this acts as a fallback
 * ensuring that all CSS & fonts still work.
 * It does not handle the customizer options, simply the frontend CSS.
 */

if ( ! class_exists ( 'Blogeasy_Kirki' )) :
	class Blogeasy_Kirki {
		/**
		 * The config ID.
		 *
		 * @static
		 * @access protected
		 * @var array
		 */
		protected static $config = array();
		/**
		 * An array of all our fields.
		 *
		 * @static
		 * @access protected
		 * @var array
		 */
		protected static $fields = array();
		/**
		 * The class constructor
		 */
		public function __construct() {
			// If Kirki exists then there's no reason to proceed.
			if ( class_exists( 'Kirki' ) ) {
				return;
			}
			// Add our CSS.
			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_styles' ), 20 );
			// Add google fonts.
			add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_fonts' ) );
		}
		/**
		 * Get the value of an option from the db.
		 *
		 * @param string $config_id The ID of the configuration corresponding to this field.
		 * @param string $field_id  The field_id (defined as 'settings' in the field arguments).
		 * @return mixed            The saved value of the field.
		 */
		public static function get_option( $config_id = '', $field_id = '' ) {
			// if Kirki exists, use it.
			if ( class_exists( 'Kirki' ) ) {
				return Kirki::get_option( $config_id, $field_id );
			}
			// Kirki does not exist, continue with our custom implementation.
			// Get the default value of the field.
			$default = '';
			if ( isset( self::$fields[ $field_id ] ) && isset( self::$fields[ $field_id ]['default'] ) ) {
				$default = self::$fields[ $field_id ]['default'];
			}
			// Make sure the config is defined.
			if ( isset( self::$config[ $config_id ] ) ) {
				if ( 'option' == self::$config[ $config_id ]['option_type'] ) {
					// check if we're using serialized options.
					if ( isset( self::$config[ $config_id ]['option_name'] ) && ! empty( self::$config[ $config_id ]['option_name'] ) ) {
						// Get all our options.
						$all_options = get_option( self::$config[ $config_id ]['option_name'], array() );
						// If our option is not saved, return the default value.
						// If option was set, return its value unserialized.
						return ( ! isset( $all_options[ $field_id ] ) ) ? $default : maybe_unserialize( $all_options[ $field_id ] );
					}
					// If we're not using serialized options, get the value and return it.
					// We'll be using a dummy default here to check if the option has been set or not.
					// We'll be using md5 to make sure it's randomish and impossible to be actually set by a user.
					$dummy = md5( $config_id . '_UNDEFINED_VALUE' );
					$value = get_option( $field_id, $dummy );
					// setting has not been set, return default.
					return ( $dummy === $value ) ? $default : $value;
				}
				// We're not using options so fallback to theme_mod.
				return get_theme_mod( $field_id, $default );
			}
		}
		/**
		 * Create a new panel.
		 *
		 * @param string $id   The ID for this panel.
		 * @param array  $args The panel arguments.
		 */
		public static function add_panel( $id = '', $args = array() ) {
			if ( class_exists( 'Kirki' ) ) {
				Kirki::add_panel( $id, $args );
			}
			/* If Kirki does not exist then there's no reason to add any panels. */
		}
		/**
		 * Create a new section.
		 *
		 * @param string $id   The ID for this section.
		 * @param array  $args The section arguments.
		 */
		public static function add_section( $id, $args ) {
			if ( class_exists( 'Kirki' ) ) {
				Kirki::add_section( $id, $args );
			}
			/* If Kirki does not exist then there's no reason to add any sections. */
		}
		/**
		 * Sets the configuration options.
		 *
		 * @param string $config_id The configuration ID.
		 * @param array  $args      The configuration arguments.
		 */
		public static function add_config( $config_id, $args = array() ) {
			// if Kirki exists, use it.
			if ( class_exists( 'Kirki' ) ) {
				Kirki::add_config( $config_id, $args );
				return;
			}
			// Kirki does not exist, set the config arguments.
			self::$config[ $config_id ] = $args;
			// Make sure an option_type is defined.
			if ( ! isset( self::$config[ $config_id ]['option_type'] ) ) {
				self::$config[ $config_id ]['option_type'] = 'theme_mod';
			}
		}
		/**
		 * Create a new field
		 *
		 * @param string $config_id The configuration ID.
		 * @param array  $args      The field's arguments.
		 * @return null
		 */
		public static function add_field( $config_id, $args ) {
			// if Kirki exists, use it.
			if ( class_exists( 'Kirki' ) ) {
				Kirki::add_field( $config_id, $args );
				return;
			}
			// Kirki was not located, so we'll need to add our fields here.
			// Check that the "settings" & "type" arguments have been defined.
			if ( isset( $args['settings'] ) && isset( $args['type'] ) ) {
				// Make sure we add the config_id to the field itself.
				// This will make it easier to get the value when generating the CSS later.
				if ( ! isset( $args['kirki_config'] ) ) {
					$args['kirki_config'] = $config_id;
				}
				self::$fields[ $args['settings'] ] = $args;
			}
		}
		/**
		 * Enqueues the stylesheet.
		 *
		 * @access public
		 * @return null
		 */
		public function enqueue_styles() {
			// If Kirki exists there's no need to proceed any further.
			if ( class_exists( 'Kirki' ) ) {
				return;
			}
			// Get our inline styles.
			$styles = $this->get_styles();
			// If we have some styles to add, add them now.
			if ( ! empty( $styles ) ) {
				// Enqueue the theme's style.css file.
				$current_theme = ( wp_get_theme() );
				wp_enqueue_style( $current_theme->stylesheet . '_no-kirki', get_stylesheet_uri(), null, null );
				wp_add_inline_style( $current_theme->stylesheet . '_no-kirki', $styles );
			}
		}
		/**
		 * Gets all our styles and returns them as a string.
		 *
		 * @access public
		 * @return string
		 */
		public function get_styles() {
			// Get an array of all our fields.
			$fields = self::$fields;
			// Check if we need to exit early.
			if ( empty( self::$fields ) || ! is_array( $fields ) ) {
				return;
			}
			// Initially we're going to format our styles as an array.
			// This is going to make processing them a lot easier
			// and make sure there are no duplicate styles etc.
			$css = array();
			// Start parsing our fields.
			foreach ( $fields as $field ) {
				// No need to process fields without an output, or an improperly-formatted output.
				if ( ! isset( $field['output'] ) || empty( $field['output'] ) || ! is_array( $field['output'] ) ) {
					continue;
				}
				// Get the value of this field.
				$value = self::get_option( $field['kirki_config'], $field['settings'] );
				// Start parsing the output arguments of the field.
				foreach ( $field['output'] as $output ) {
					$output = wp_parse_args( $output, array(
						'element'       => '',
						'property'      => '',
						'media_query'   => 'global',
						'prefix'        => '',
						'units'         => '',
						'suffix'        => '',
						'value_pattern' => '$',
						'choice'        => '',
					) );
					// If element is an array, convert it to a string.
					if ( is_array( $output['element'] ) ) {
						$output['element'] = implode( ',', $output['element'] );
					}
					// Simple fields.
					if ( ! is_array( $value ) ) {
						$value = str_replace( '$', $value, $output['value_pattern'] );
						if ( ! empty( $output['element'] ) && ! empty( $output['property'] ) ) {
							$css[ $output['media_query'] ][ $output['element'] ][ $output['property'] ] = $output['prefix'] . $value . $output['units'] . $output['suffix'];
						}
					} else {
						if ( 'typography' === $field['type'] ) {
							foreach ( $value as $key => $subvalue ) {
								// Add double quotes if needed to font-families.
								if ( 'font-family' == $key && false !== strpos( $subvalue, ' ' ) && false === strpos( $subvalue, '"' ) ) {
									$css[ $output['media_query'] ][ $output['element'] ]['font-family'] = '"' . $subvalue . '"';
								}
								// Variants contain both font-weight & italics.
								if ( 'variant' === $key ) {
									$font_weight = str_replace( 'italic', '', $subvalue );
									$font_weight = ( in_array( $font_weight, array( '', 'regular' ) ) ) ? '400' : $font_weight;
									$css[ $output['media_query'] ][ $output['element'] ]['font-weight'] = $font_weight;
									// Is this italic?
									if ( false !== strpos( $subvalue, 'italic' ) ) {
										$css[ $output['media_query'] ][ $output['element'] ]['font-style'] = 'italic';
									}
								} else {
									$css[ $output['media_query'] ][ $output['element'] ][ $key ] = $subvalue;
								}
							}
						} elseif ( 'multicolor' == $field['type'] ) {
							if ( ! empty( $output['element'] ) && ! empty( $output['property'] ) && ! empty( $output['choice'] ) ) {
								$css[ $output['media_query'] ][ $output['element'] ][ $output['property'] ] = $output['prefix'] . $value[ $output['choice'] ] . $output['units'] . $output['suffix'];
							}
						} else {
							foreach ( $value as $key => $subvalue ) {
								$property = $key;
								if ( false !== strpos( $output['property'], '%%' ) ) {
									$property = str_replace( '%%', $key, $output['property'] );
								} elseif ( ! empty( $output['property'] ) ) {
									$output['property'] = $output['property'] . '-' . $key;
								}
								if ( 'background-image' === $output['property'] && false === strpos( $subvalue, 'url(' ) ) {
									$subvalue = 'url("' . set_url_scheme( $subvalue ) . '")';
								}
								if ( $subvalue ) {
									$css[ $output['media_query'] ][ $output['element'] ][ $property ] = $subvalue;
								}
							}
						}
					}
				}
			}
			// Process the array of CSS properties and produce the final CSS.
			$final_css = '';
			if ( ! is_array( $css ) || empty( $css ) ) {
				return '';
			}
			// Parse the generated CSS array and create the CSS string for the output.
			foreach ( $css as $media_query => $styles ) {
				// Handle the media queries.
				$final_css .= ( 'global' != $media_query ) ? $media_query . '{' : '';
				foreach ( $styles as $style => $style_array ) {
					$final_css .= $style . '{';
					foreach ( $style_array as $property => $value ) {
						$value = ( is_string( $value ) ) ? $value : '';
						// Make sure background-images are properly formatted.
						if ( 'background-image' === $property ) {
							if ( false === strrpos( $value, 'url(' ) ) {
								$value = set_url_scheme( $value );
								$value = 'url("' . esc_url_raw( $value ) . '")';
							}
						} else {
							$value = esc_textarea( $value );
						}
						$final_css .= $property . ':' . $value . ';';
					}
					$final_css .= '}';
				}
				$final_css .= ( 'global' != $media_query ) ? '}' : '';
			}
			return $final_css;
		}
		/**
		 * Enqueue google fonts.
		 *
		 * @access public
		 * @return null
		 */
		public function enqueue_fonts() {
			// Check if we need to exit early.
			if ( empty( self::$fields ) || ! is_array( self::$fields ) ) {
				return;
			}
			foreach ( self::$fields as $field ) {
				// Process typography fields.
				if ( isset( $field['type'] ) && 'typography' == $field['type'] ) {
					// Check if we've got everything we need.
					if ( ! isset( $field['kirki_config'] ) || ! isset( $field['settings'] ) ) {
						continue;
					}
					$value = self::get_option( $field['kirki_config'], $field['settings'] );
					if ( isset( $value['font-family'] ) ) {
						$url = '//fonts.googleapis.com/css?family=' . str_replace( ' ', '+', $value['font-family'] );
						$value['variant'] = ( isset( $value['variant'] ) ) ? $value['variant'] : '';
						$url .= ( empty( $value['variant'] ) ) ? '' : ':' . $value['variant'];
						$key = md5( $value['font-family'] . $value['variant'] );
						// Check that the URL is valid. we're going to use transients to make this faster.
						$url_is_valid = get_transient( $key );
						// If transient does not exist.
						if ( false === $url_is_valid ) {
							$response = wp_remote_get( 'https:' . $url );
							if ( ! is_array( $response ) ) {
								// The url was not properly formatted,
								// cache for 12 hours and continue to the next field.
								set_transient( $key, null, 12 * HOUR_IN_SECONDS );
								continue;
							}
							// Check the response headers.
							if ( isset( $response['response'] ) && isset( $response['response']['code'] ) ) {
								if ( 200 == $response['response']['code'] ) {
									// URL was ok. Set transient to true and cache for a week.
									set_transient( $key, true, 7 * 24 * HOUR_IN_SECONDS );
									$url_is_valid = true;
								}
							}
						}
						// If the font-link is valid, enqueue it.
						if ( $url_is_valid ) {
							wp_enqueue_style( $key, $url, null, null );
						}
					}
				}
			}
		}
	}
endif;
new Blogeasy_Kirki();
